Objective Questions

-------------------

.. A mininum of 8 questions here (along with answers)

1. What will be output of the following code snippet,

   ::

	from math import sqrt

	def sqrt(i):

       	    return i

        print sqrt(49)

   a. 7.0

   #. 7

   #. 49

   #. 49.0

   #. Error

Answer: 49

2. What will be the output of the following code snippet,

   ::

        import math

        def sqrt(i):

            x = math.sqrt(i)

	    if int(x) == x:

	        return int(x)

	    else:

	        return x

        print math.sqrt(50), sqrt(50), math.sqrt(49), sqrt(49)

   a. 7.0710678118654755 7 7 7

   #. 7.0710678118654755 7 7.0 7

   #. 7 7 7 7

   #. 7.0710678118654755 7.0710678118654755 7.0 7

Answer: 7.0710678118654755, 7.0710678118654755, 7.0, 7

3. ``from math import *`` and ``import math`` does the same,

   a. True

   #. False

Answer: False

4. Which among these libraries is part of python standard library,

   a. Mayavi

   #. scipy

   #. matplotlib

   #. urllib2

Answer: urllib2

5. ``pylab.plot(x,sin(x))`` can be used in a script with ``from pylab

   import *``

   a. True

   #. False

Answer: False

6. Which among this is correct,

   a. from scipy import plot

   #. from numpy import plot

   #. from matplotlib import plot

   #. from pylab import plot

   #. None of the above

Answer: from pylab import plot

7. Functions ``xlim()`` and ``ylim()`` can be imported to the current

   name-space as,

   a. from pylab import xlim, ylim

   #. import pylab

   #. from scipy import xlim, ylim

   #. import scipy

Answer: from pylab import xlim, ylim

8. ``scipy.linspace(-5*scipy.pi, 5*scipy.pi, 500)``

   a. creates an array of 500 equally spaced elements from -5*scipy.pi

      to 5*scipy.pi(excluded)

   #. creates an array of 500 equally spaced elements from

      -5*scipy.pi(excluded) to 5*scipy.pi(included)

   #. creates an array of 500 equally spaced elements from -5*scipy.pi

      to 5*scipy.pi, both end points included

   #. created an array of 500 equally spaced elements from -5*scipy.pi

      to 5*scipy.pi, both end points excluded.

   #. None of the above

Answer: creates an array of 500 equally spaced elements from

	-5*scipy.pi to 5*scipy.pi, both end points included

Larger Questions

----------------

.. A minimum of 2 questions here (along with answers)

1. Write a python script to plot a red colour tan plot between -pi to

   pi, with x limits from -pi to pi. Label the figure appropriately

   and with a legend 'tan(x)' and title 'tangent plot'. Label the axes

   x as 'x' and y as 'tan(x)'. Make sure the script can be executed as

   a python script.

2. Write a python script to plot a parabola of the form y^2=4ax with a

   = 0.5(a is the directrix), plot the line in green color add the

   legend as 'y^2=4ax' and title as 'parabola'. For x from -20 to 20

   with 100 equidistant points. Make sure the script can be executed

   as a python script. [`Hint`: Use parametric equations]